In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.
What is freezing?It is a physical change in which liquids give off heat to form solids.
We have 210.0 g of water at 0°C. We can calculate the amount of heat given off when it freezes into ice using the following expression.
Q = ΔH°fus × m
Q = 0.334 kJ/g × 210.0 g = 70.1 kJ
where,
Q is the heat released.ΔH°fus is the latent heat of fusion.m is the mass.In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.
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Which SI units are used to describe energy
Answer:
The SI units used to describe energy is Joule (J)
A 5000kva 230/13. 8kv single phase power transformer has a resistance of 0. 38 ohms and reactance of 1. 9 ohms
The reactance of the circuit will be 5.233×10⁻⁴ ohm. Inductive reactance is the product of 2 times π frequency and the coil inductance.
What is reactance?
When alternating electricity passes through pure reactance, it causes a voltage drop that is 90 degrees out of phase with the current.
The letter “X” is used to represent reactance in mathematics, and it is measured in ohms.
The inductive reactance of a coil is calculated using the following formula:
Inductive reactance, or XL, is the product of 2 times p (pi), and the frequency of the ac current in hertz, and the coil inductance in henries.
XL= 2πfL
Where,
f {frequency)
L (Inductance)
The reactance of the circuit is found as;
[tex]\rm R_{new}=0.38[{(\frac{1}{60} )^2][/tex]
[tex]\rm R_{new}=1.055 \times 10^{-4} \ ohm[/tex]
The inductance of the circuit is;
[tex]\rm X_{new}=1.9(\frac{1}{60} )^2\\\\X_{new}= 5.233 \times 10^{-4}\ ohm[/tex]
Hence, the reactance of the circuit will be 5.233×10⁻⁴ ohm.
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Gravity and magnetism are both
A common forces
B natural cycles
C states of matter
D forms of energy
Answer:
Explanation:
Comment
You have to read this carefully enough that you don't mix up energy and forces.
Gravity is a force. If you don't believe me try jumping off a building. Which way are you going to go and why? Down because gravity attracts your mass.
So Magnetism must be a force as well. It acts in one direction, but not a specific one the way gravity acts). It also either attracts or repulses (pushes an object away)
Answer A
what is the most similar to the Sun in luminosity and temperature
Explanation:
At a distance of 4.25 light years, Proxima is the closest-known star to our solar system. Science of the Alpha Centauri system. The two stars that make up Alpha Centauri, Rigil Kentaurus and Toliman, are quite similar to our sun
The fastest train in the world moves at 500 km/hr. How far will it go in 3 hours?
Answer:
1500 because i aded 500+500+500= 1500 km/hr thats how i got my answer
Explanation:
Answer:
1500 kmh
Explanation:
500+500+500 making it 1500
Why can we see the moon at
night?
a. the moon is luminous and produces its own
light.
b. light from the earth is reflected back to us off
of the moon.
c. light from the sun is reflected back to us off
the moon
d. light from the sun is absorbed by the moon.
Answer:
c. light from the sun is reflected back to us off the moon
Explanation:
the moon does not produce its own light
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 240 m, how long does Superguy have to save Lois, and what must be his average speed
If the elevator falls from a height of 240 meters and Superguy is 1 km away, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.
What is the average speed?The total distance traveled by an object divided by the total time taken is the average speed.
The average speed of an object indicates the pace at which it will traverse a distance. The metric unit of speed is the meter per second.
Given data:
Distance of super guy from the tower = 1.00 km
height(h)= 240 m
From the Newtons' second equation of motion:
[tex]\rm S= ut+\frac{1}{2} at^2 \\\\\ 210 = 0+\frac{10}{2} t^2 \\\\ t= \sqrt 42\\\\t=6.5 \ sec[/tex]
Distance is the foundation as the product the velocity and time;
D=ut
u=d/t
u=1000/t
u=1000/6.5
u=150 m/sec
Hence, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.
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Write a hypothesis about the effects of magnetic and electric fields. Use the format of "if . . . then . . . because . . ." and be sure to answer the lesson question: "How can magnetic and electric fields be demonstrated?"
If the charged particle moves in the magnetic field or electric field, then it experiences magnetic force or electric force because of its magnetic or electric properties.
What is magnetic field?The magnetic field is the region of space where a charged object experiences magnetic force when it is moving.
When a charged particle such as an electron or proton moves inside a conductor, magnetic lines of force rotate around the particle. This relative motion causes the magnetic field to generate.
Thus, If the charged particle moves in the magnetic field or electric field, then it experiences magnetic force or electric force because of its magnetic or electric properties.
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Answer:
If a magnetic or electric field is present, materials that generate these fields will interact by attracting or repelling each other because of their magnetic or electric properties.
Explanation:
Discuss the 3 most important lessons you learned in this class. explain why they were so meaningful? how will critical thinking help you "realize potential-the ultimate objective"?
The three most important lessons learned in the school are never cheat, make less but selfless friends and respect teachers.
What is critical thinking?
Critical thinking is the action done by the person that has a wide range of thinking skills that eventually leads to a desired outcome.
The important lessons one learn being in schools that are crucial forr the whole life are never cheat, make less but selfless friends and respect teachers.
Critical thinking makes one realize his inner potential. The potential is the desired outcome and it is the final objective of the person.
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How can water cause the loss
of soil from bare farm fields on slopes?
How can this erosion be prevented?
Answer:
Soil erosion by water occurs when bare-sloped soil surface is exposed to rainfall, and the rainfall intensity exceeds the rate of soil intake, or infiltration rate, leading to soil-surface runoff.
Explanation:
Surface cover and runoff. Surface cover is a major factor to control erosion because it reduces the impact of raindrops falling on bare soils and wind removing soil particles. It also reduces the speed of water flowing over the land. Erosion risk is significantly reduced when there is more than 30% soil cover.
Answer:
by natural process of flood
by blasting of dam
increasing the water level
What Is meant By MA of a machine is 2?
Answer:
See below ~
Explanation:
The Mechanical Advantage (MA) is defined as the ratio between the force produced by the machine to the force applied to it.
=============================================================
So,
⇒ [tex]\frac{F(out)}{F(in)} = 2[/tex]
⇒ This means that the force produced is twice the applied force
the conclusion of neutralization reaction
neutralization reactions occur when you combine two extremely reactive substances together for the purpose of rendering them inactive, or neutral.
Which set-up has the stronger magnetic field?
Answer:
set-up X
Explanation:
Assuming that both nails are iron and the charge of the battery is the same, set-up X has a stronger magnetic field.
The more coils [turns] made around a nail, the stronger the electromagnet / magnetic field will be because each coil/loop essentially sets up its own magnetic field.
Hope this helps!!
How can biomass energy use improve water quality? a. the combustion of biomass material to produce energy improves water quality by filtering out pollutants. b. biomass energy use does not require water, which reduces the impact of other energy producing technologies on water quality. c. soil erosion and sedimentation are decreased during biomass crop growth. d. all of the above please select the best answer from the choices provided a b c d
The biomass energy can use improve water quality in soil erosion and sedimentation are decreased during biomass crop growth. The correct option is C.
What is biomass energy?Biomass energy is obtained by the processing of the dead plants and animal or vegetable, cow dung or wood.
The biomass energy obtained by these bio things, it is enriched with the nutrients required by the new crop plants to grow effectively.
The biomass energy provides good water quality by soil erosion and sedimentation.
Thus, The correct option is C.
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jennifer is pulling her little brother, michael, by the hand because she wants to leave the zoo, but he cant stop crying and wanting to see the monkeys. she applies a force of 35 N and the force of her brother is 20 N
is jennifer able to drag her brother out of the zoo? how do u know
what is the total net force...show your work
draw a force schema. label ALL components and draw vector quantities that include the direction and amount of force
Jennifer is able to drag her brother out of the zoo due to an applied net force of 15 N.
What is force?Force refers to any agent which tends to cause a change in the motion or state of an object.
Forces are of two types;
contact forces, and Non-contact forcesThe net force is the difference between two forces which causes a change in the motion of an object.
The net force that Jennifer applies = 35 N - 20 N = 15 N
Therefore, Jennifer is able to drag her brother out of the zoo due to an applied net force of 15 N.
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A good long distance runner has an average speed of 5.5m/a. How far would the runner go in 30 mins
Explanation:
if the runner maintains an average speed of 5.5 m/s
we can use the formula
vt = d
hence the answer would be:
5.5 × (30 × 60)
note: we have to convert meter to second which is the SI unit.
answer: 4950 meters
A car of mass 1500 kg is moving with a velocity of 72 km/h. When the driver applied brakes, the velocity of the car reached 10 km/h by travelling the distance of 50 m. Calculate the amount of force applied in the car during that time.
Explanation:
friend I have solved it as we know that force = mass *acceleration and by the equations of motion
To solve this, we must be knowing each and every concept related to force and its calculation. Therefore, the amount of force applied in the car during the time is 6000N.
What is fundamental force?Nature is governed by four fundamental or universal forces. All stuff in the universe would disintegrate in the absence of these forces. Any pull or push that causes an item to change its physical condition is referred to as force (in terms of motion or deformity).
Mathematically,
V²-u²=2aS
V=72 km/h=72000/3600=20m/s
u=0m/s
s= 50 m
substituting all the given values in the above equation, we get
20²-0²=2×a×50
a=4m/s²
Force = mass ×acceleration
substituting all the given values in the above equation, we get
1500 kg=mass
Force = 1500 ×4
=6000N
Therefore, the amount of force applied in the car during the time is 6000N.
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In dc electrode positive, how much power is at the work clamp?.
Answer:
1/3 power
Explanation:
I'm just a smart guy
HELPPPPP PLEASEEEEEE
The diagram shows a simple circuit. Which change would cause the light-bulb to get brighter?
A) Increase the length of the wire between the switch and the battery.
B) Decrease the length of the wire between the switch and the battery.
C) Reverse the direction of the battery.
D) Swap the positions of the lightbulb and the switch.
The correct option is B. Decrease the length of the wire between the switch and the battery.
Resistivity of wire
The resistivity of a wire is the measure of the opposition to the flow of current offered by the wire.
ρ = RA/L
RA = ρL
R = ρL/A
where;
ρ is resistivity of the wireR is resistance of the wireL is lengthA is areaDecrease in length of the wire will cause a decrease in the resistance of the wire, and it will increase the current flowing in the wire, causing the bulb to glow brighter.
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As stream discharge increases ________. only velocity increases velocity, width, and depth increase velocity, width, and depth decrease only depth increases
As stream discharge increases, only velocity increases.
What is discharge?The discharge or volume flow rate is defined as the product of the velocity of the fluid and the area of cross- section of the pipe or tube.
Discharge Q = Area A x Velocity V
Q = AV
The discharge is directly proportional to the velocity of the fluid. When discharge increases, velocity is the only physical quantity that can be changed.
Thus, As stream discharge increases, only velocity increases.
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The quarks that compose a baryon may have charges of.
The quarks that compose a baryon may have negative and positive charges of +(2/3)e, -(1/3)e.
What is a quark?A quark is a type of particle that forms protons and neutrons and combines to generate particles called hadrons.
Protons and neutrons may be formed by up quarks and down quarks that have a charge equal to -1/3e.
In conclusion, the quarks that compose a baryon may have negative and positive charges of +(2/3)e, -(1/3)e.
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Why is Radiology important in the medical field?
Answer:
Radiology plays a huge role in disease management by giving physicians more options, tools, and techniques for detection and treatment. Diagnostic imaging allows for detailed information about structural or disease-related changes. With the ability to diagnose during the early stages, patients may be saved.
Explanation:
when a metal sphere is dropped in to a tall cylinder containing liquid its acceleration is g÷2 (gravity over 2) show that : density of metal =2density of liquid
The density of the metal is twice the density of liquid since acceleration, a is half of accelerating due to gravity, g.
What is the relationship between acceleration and density?For a solid falling through a viscous fluid, the acceleration of the object decreases until it attains terminal velocity.
The acceleration of the body increases with increase in density of the solid.
When density of solid = density of liquid, acceleration a = g
When density of solid = 2 × density of the liquid, acceleration a = g/2.
Therefore, the density of the metal is twice the density of liquid since acceleration, a is half of accelerating due to gravity, g.
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Which three factors are used to calculate gravitational potential energy?
A. The height of an object
Jury
B. The mass of an object
C. The chemical formula for an object
D. The velocity of an object
E. The acceleration of an object due to gravity
F. The density of an object
Answer:
Height, mass, acceleration.
Explanation:
I hope it helps u dear! ^_^
A boy throws a toy up in the air with an initial velocity of 7.9 m/s at an angle of 37 degrees . what is the maximum height reached by the toy?
The maximum height reached by the toy at the given velocity and angle of projection is determined as 1.15 m.
Maximum height reached by the toyThe maximum height reached by the toy is calculated as follows;
H = u²sin²θ/2g
where;
u is the initial velocityθ is the angle of projectiong is gravityH = (7.9² x (sin37)²)/(2 x 9.8)
H = 1.15 m
Thus, the maximum height reached by the toy at the given velocity and angle of projection is determined as 1.15 m.
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what is the direction of the magnetic force on the charge
Answer: A
Explanation:
The weight of a body is 147N. what is its mass?
To find the mass, with only the weight:
⇒ must consider the relationship between the mass and weight
⇒ (in other words) we must find the equation that has both the
mass and weight
Based on our physics knowledge, we know:
[tex]Weight=mass*gravitational_. acceleration[/tex]
Weight: 147NGravitational Acceleration: 9.8 m/s²Now let's plug in the values, and solve:
[tex]147N = mass*9.8_.m/s^2\\mass = 15_.kg[/tex]
Answer: 15 kg
Hope that helps!
*as a note, if you use the gravitational acceleration as 10m/s², then the answer would be 14.7 kg
what kind of intermolecular force is H2O
Answer: H2O has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces.
Explanation:
Answer:
The H2O water molecule is polar with intermolecular dipole-dipole hydrogen bonds. As the water molecules attract each other and form bonds, water displays properties such as high surface tension and a high heat of vaporization
Need help asap please!
what produces the emf in an electric generator?
a coil rotating in a magnetic field to change its flux
an electric current in a coil that produces a torque on the coil to make it rotate
an electric battery
the repulsion between a positive charge and the north pole of a magnet
Answer:
a coil rotating in a magnetic field to change its flux